# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: pathlib.py
import fnmatch, functools, io, ntpath, os, posixpath, re, sys
from collections import Sequence
from contextlib import contextmanager
from errno import EINVAL, ENOENT, ENOTDIR
from operator import attrgetter
from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
from urllib.parse import quote_from_bytes as urlquote_from_bytes

supports_symlinks = True
if os.name == "nt":
    import nt

    if sys.getwindowsversion()[:2] >= (6, 0):
        from nt import _getfinalpathname
    else:
        supports_symlinks = False
        _getfinalpathname = None
else:
    nt = None
__all__ = [
    "PurePath",
    "PurePosixPath",
    "PureWindowsPath",
    "Path",
    "PosixPath",
    "WindowsPath",
]


def _is_wildcard_pattern(pat):
    return "*" in pat or "?" in pat or "[" in pat


class _Flavour(object):
    """A flavour implements a particular (platform-specific) set of path
    semantics."""

    def __init__(self):
        self.join = self.sep.join

    def parse_parts(self, parts):
        parsed = []
        sep = self.sep
        altsep = self.altsep
        drv = root = ""
        it = reversed(parts)
        for part in it:
            if not part:
                continue
            if altsep:
                part = part.replace(altsep, sep)
            drv, root, rel = self.splitroot(part)
            if sep in rel:
                for x in reversed(rel.split(sep)):
                    if x:
                        if x != ".":
                            parsed.append(sys.intern(x))

            else:
                if rel:
                    if rel != ".":
                        parsed.append(sys.intern(rel))
            if drv or root:
                if not drv:
                    for part in it:
                        if not part:
                            continue
                        if altsep:
                            part = part.replace(altsep, sep)
                        drv = self.splitroot(part)[0]
                        if drv:
                            break

                break

        if drv or root:
            parsed.append(drv + root)
        parsed.reverse()
        return (drv, root, parsed)

    def join_parsed_parts(self, drv, root, parts, drv2, root2, parts2):
        """
        Join the two paths represented by the respective
        (drive, root, parts) tuples.  Return a new (drive, root, parts) tuple.
        """
        if root2:
            if not drv2:
                if drv:
                    return (drv, root2, [drv + root2] + parts2[1:])
            else:
                if drv2:
                    if drv2 == drv or self.casefold(drv2) == self.casefold(drv):
                        return (drv, root, parts + parts2[1:])
                else:
                    return (drv, root, parts + parts2)
                return (drv2, root2, parts2)


class _WindowsFlavour(_Flavour):
    sep = "\\"
    altsep = "/"
    has_drv = True
    pathmod = ntpath
    is_supported = os.name == "nt"
    drive_letters = set((chr(x) for x in range(ord("a"), ord("z") + 1))) | set(
        (chr(x) for x in range(ord("A"), ord("Z") + 1))
    )
    ext_namespace_prefix = "\\\\?\\"
    reserved_names = (
        {"CON", "PRN", "AUX", "NUL"}
        | {"COM%d" % i for i in range(1, 10)}
        | {"LPT%d" % i for i in range(1, 10)}
    )

    def splitroot(self, part, sep=sep):
        first = part[0:1]
        second = part[1:2]
        if second == sep:
            if first == sep:
                prefix, part = self._split_extended_path(part)
                first = part[0:1]
                second = part[1:2]
            prefix = ""
        third = part[2:3]
        if second == sep and first == sep and third != sep:
            index = part.find(sep, 2)
            if index != -1:
                index2 = part.find(sep, index + 1)
                if index2 != index + 1:
                    if index2 == -1:
                        index2 = len(part)
                    if prefix:
                        return (prefix + part[1:index2], sep, part[index2 + 1 :])
                    return (part[:index2], sep, part[index2 + 1 :])
                drv = root = ""
                if second == ":":
                    if first in self.drive_letters:
                        drv = part[:2]
                        part = part[2:]
                        first = third
                if first == sep:
                    root = first
                    part = part.lstrip(sep)
                return (prefix + drv, root, part)

    def casefold(self, s):
        return s.lower()

    def casefold_parts(self, parts):
        return [p.lower() for p in parts]

    def resolve(self, path, strict=False):
        s = str(path)
        if not s:
            return os.getcwd()
        previous_s = None
        if _getfinalpathname is not None:
            if strict:
                return self._ext_to_normal(_getfinalpathname(s))
            tail_parts = []
            while True:
                try:
                    s = self._ext_to_normal(_getfinalpathname(s))
                except FileNotFoundError:
                    previous_s = s
                    s, tail = os.path.split(s)
                    tail_parts.append(tail)
                    if previous_s == s:
                        return path

                return os.path.join(s, *reversed(tail_parts))

    def _split_extended_path(self, s, ext_prefix=ext_namespace_prefix):
        prefix = ""
        if s.startswith(ext_prefix):
            prefix = s[:4]
            s = s[4:]
            if s.startswith("UNC\\"):
                prefix += s[:3]
                s = "\\" + s[3:]
        return (prefix, s)

    def _ext_to_normal(self, s):
        return self._split_extended_path(s)[1]

    def is_reserved(self, parts):
        if not parts:
            return False
        elif parts[0].startswith("\\\\"):
            return False
        else:
            return parts[-1].partition(".")[0].upper() in self.reserved_names

    def make_uri(self, path):
        drive = path.drive
        if len(drive) == 2:
            if drive[1] == ":":
                rest = path.as_posix()[2:].lstrip("/")
                return "file:///%s/%s" % (
                    drive,
                    urlquote_from_bytes(rest.encode("utf-8")),
                )
            return "file:" + urlquote_from_bytes(path.as_posix().encode("utf-8"))

    def gethomedir(self, username):
        if "HOME" in os.environ:
            userhome = os.environ["HOME"]
        else:
            if "USERPROFILE" in os.environ:
                userhome = os.environ["USERPROFILE"]
            else:
                if "HOMEPATH" in os.environ:
                    try:
                        drv = os.environ["HOMEDRIVE"]
                    except KeyError:
                        drv = ""

                    userhome = drv + os.environ["HOMEPATH"]
                else:
                    raise RuntimeError("Can't determine home directory")
                if username:
                    if os.environ["USERNAME"] != username:
                        drv, root, parts = self.parse_parts((userhome,))
                        if parts[-1] != os.environ["USERNAME"]:
                            raise RuntimeError(
                                "Can't determine home directory for %r" % username
                            )
                        parts[-1] = username
                        if drv or root:
                            userhome = drv + root + self.join(parts[1:])
                        else:
                            userhome = self.join(parts)
                        return userhome


class _PosixFlavour(_Flavour):
    sep = "/"
    altsep = ""
    has_drv = False
    pathmod = posixpath
    is_supported = os.name != "nt"

    def splitroot(self, part, sep=sep):
        if part:
            if part[0] == sep:
                stripped_part = part.lstrip(sep)
                if len(part) - len(stripped_part) == 2:
                    return ("", sep * 2, stripped_part)
                return ("", sep, stripped_part)
        else:
            return ("", "", part)

    def casefold(self, s):
        return s

    def casefold_parts(self, parts):
        return parts

    def resolve(self, path, strict=False):
        sep = self.sep
        accessor = path._accessor
        seen = {}

        def _resolve(path, rest):
            if rest.startswith(sep):
                path = ""
            for name in rest.split(sep):
                if not not name:
                    if name == ".":
                        pass
                    else:
                        if name == "..":
                            path, _, _ = path.rpartition(sep)
                            continue
                            newpath = path + sep + name
                            if newpath in seen:
                                path = seen[newpath]
                                if path is not None:
                                    pass
                                else:
                                    raise RuntimeError("Symlink loop from %r" % newpath)
                            try:
                                target = accessor.readlink(newpath)
                            except OSError as e:
                                if e.errno != EINVAL:
                                    if strict:
                                        raise
                                path = newpath

                            seen[newpath] = None
                            path = _resolve(path, target)
                            seen[newpath] = path

            return path

        base = "" if path.is_absolute() else os.getcwd()
        return _resolve(base, str(path)) or sep

    def is_reserved(self, parts):
        return False

    def make_uri(self, path):
        bpath = bytes(path)
        return "file://" + urlquote_from_bytes(bpath)

    def gethomedir(self, username):
        if not username:
            try:
                return os.environ["HOME"]
            except KeyError:
                import pwd

                return pwd.getpwuid(os.getuid()).pw_dir

        else:
            import pwd
        try:
            return pwd.getpwnam(username).pw_dir
        except KeyError:
            raise RuntimeError("Can't determine home directory for %r" % username)


_windows_flavour = _WindowsFlavour()
_posix_flavour = _PosixFlavour()


class _Accessor:
    """An accessor implements a particular (system-specific or not) way of
    accessing paths on the filesystem."""

    pass


class _NormalAccessor(_Accessor):
    def _wrap_strfunc(strfunc):
        @functools.wraps(strfunc)
        def wrapped(pathobj, *args):
            return strfunc(str(pathobj), *args)

        return staticmethod(wrapped)

    def _wrap_binary_strfunc(strfunc):
        @functools.wraps(strfunc)
        def wrapped(pathobjA, pathobjB, *args):
            return strfunc(str(pathobjA), str(pathobjB), *args)

        return staticmethod(wrapped)

    stat = _wrap_strfunc(os.stat)
    lstat = _wrap_strfunc(os.lstat)
    open = _wrap_strfunc(os.open)
    listdir = _wrap_strfunc(os.listdir)
    scandir = _wrap_strfunc(os.scandir)
    chmod = _wrap_strfunc(os.chmod)
    if hasattr(os, "lchmod"):
        lchmod = _wrap_strfunc(os.lchmod)
    else:

        def lchmod(self, pathobj, mode):
            raise NotImplementedError("lchmod() not available on this system")

    mkdir = _wrap_strfunc(os.mkdir)
    unlink = _wrap_strfunc(os.unlink)
    rmdir = _wrap_strfunc(os.rmdir)
    rename = _wrap_binary_strfunc(os.rename)
    replace = _wrap_binary_strfunc(os.replace)
    if nt:
        if supports_symlinks:
            symlink = _wrap_binary_strfunc(os.symlink)
        else:

            def symlink(a, b, target_is_directory):
                raise NotImplementedError("symlink() not available on this system")

    else:

        @staticmethod
        def symlink(a, b, target_is_directory):
            return os.symlink(str(a), str(b))

    utime = _wrap_strfunc(os.utime)

    def readlink(self, path):
        return os.readlink(path)


_normal_accessor = _NormalAccessor()


def _make_selector(pattern_parts):
    pat = pattern_parts[0]
    child_parts = pattern_parts[1:]
    if pat == "**":
        cls = _RecursiveWildcardSelector
    else:
        if "**" in pat:
            raise ValueError(
                "Invalid pattern: '**' can only be an entire path component"
            )
        else:
            if _is_wildcard_pattern(pat):
                cls = _WildcardSelector
            else:
                cls = _PreciseSelector
            return cls(pat, child_parts)


if hasattr(functools, "lru_cache"):
    _make_selector = functools.lru_cache()(_make_selector)


class _Selector:
    """A selector matches a specific glob pattern part against the children
    of a given path."""

    def __init__(self, child_parts):
        self.child_parts = child_parts
        if child_parts:
            self.successor = _make_selector(child_parts)
            self.dironly = True
        else:
            self.successor = _TerminatingSelector()
            self.dironly = False

    def select_from(self, parent_path):
        """Iterate over all child paths of `parent_path` matched by this
        selector.  This can contain parent_path itself."""
        path_cls = type(parent_path)
        is_dir = path_cls.is_dir
        exists = path_cls.exists
        scandir = parent_path._accessor.scandir
        if not is_dir(parent_path):
            return iter([])
        else:
            return self._select_from(parent_path, is_dir, exists, scandir)


class _TerminatingSelector:
    def _select_from(self, parent_path, is_dir, exists, scandir):
        yield parent_path


class _PreciseSelector(_Selector):
    def __init__(self, name, child_parts):
        self.name = name
        _Selector.__init__(self, child_parts)

    def _select_from(self, parent_path, is_dir, exists, scandir):
        try:
            path = parent_path._make_child_relpath(self.name)
            if (is_dir if self.dironly else exists)(path):
                for p in self.successor._select_from(path, is_dir, exists, scandir):
                    yield p

        except PermissionError:
            return


class _WildcardSelector(_Selector):
    def __init__(self, pat, child_parts):
        self.pat = re.compile(fnmatch.translate(pat))
        _Selector.__init__(self, child_parts)

    def _select_from(self, parent_path, is_dir, exists, scandir):
        try:
            cf = parent_path._flavour.casefold
            entries = list(scandir(parent_path))
            for entry in entries:
                if not self.dironly or entry.is_dir():
                    name = entry.name
                    casefolded = cf(name)
                    if self.pat.match(casefolded):
                        path = parent_path._make_child_relpath(name)
                        for p in self.successor._select_from(
                            path, is_dir, exists, scandir
                        ):
                            yield p

        except PermissionError:
            return


class _RecursiveWildcardSelector(_Selector):
    def __init__(self, pat, child_parts):
        _Selector.__init__(self, child_parts)

    def _iterate_directories(self, parent_path, is_dir, scandir):
        yield parent_path
        try:
            entries = list(scandir(parent_path))
            for entry in entries:
                if entry.is_dir():
                    if not entry.is_symlink():
                        path = parent_path._make_child_relpath(entry.name)
                        for p in self._iterate_directories(path, is_dir, scandir):
                            yield p

        except PermissionError:
            return

    def _select_from(self, parent_path, is_dir, exists, scandir):
        try:
            yielded = set()
            try:
                successor_select = self.successor._select_from
                for starting_point in self._iterate_directories(
                    parent_path, is_dir, scandir
                ):
                    for p in successor_select(starting_point, is_dir, exists, scandir):
                        if p not in yielded:
                            yield p
                            yielded.add(p)

            finally:
                yielded.clear()

        except PermissionError:
            return


class _PathParents(Sequence):
    """This object provides sequence-like access to the logical ancestors
    of a path.  Don't try to construct it yourself."""

    __slots__ = ("_pathcls", "_drv", "_root", "_parts")

    def __init__(self, path):
        self._pathcls = type(path)
        self._drv = path._drv
        self._root = path._root
        self._parts = path._parts

    def __len__(self):
        if self._drv or self._root:
            return len(self._parts) - 1
        else:
            return len(self._parts)

    def __getitem__(self, idx):
        if idx < 0 or idx >= len(self):
            raise IndexError(idx)
        return self._pathcls._from_parsed_parts(
            self._drv, self._root, self._parts[: -idx - 1]
        )

    def __repr__(self):
        return ("<{}.parents>").format(self._pathcls.__name__)


class PurePath(object):
    """PurePath represents a filesystem path and offers operations which
    don't imply any actual filesystem I/O.  Depending on your system,
    instantiating a PurePath will return either a PurePosixPath or a
    PureWindowsPath object.  You can also instantiate either of these classes
    directly, regardless of your system.
    """

    __slots__ = (
        "_drv",
        "_root",
        "_parts",
        "_str",
        "_hash",
        "_pparts",
        "_cached_cparts",
    )

    def __new__(cls, *args):
        """Construct a PurePath from one or several strings and or existing
        PurePath objects.  The strings and path objects are combined so as
        to yield a canonicalized path, which is incorporated into the
        new PurePath object.
        """
        if cls is PurePath:
            cls = PureWindowsPath if os.name == "nt" else PurePosixPath
        return cls._from_parts(args)

    def __reduce__(self):
        return (self.__class__, tuple(self._parts))

    @classmethod
    def _parse_args(cls, args):
        parts = []
        for a in args:
            if isinstance(a, PurePath):
                parts += a._parts
            else:
                a = os.fspath(a)
                if isinstance(a, str):
                    parts.append(str(a))
                else:
                    raise TypeError(
                        "argument should be a str object or an os.PathLike object returning str, not %r"
                        % type(a)
                    )

        return cls._flavour.parse_parts(parts)

    @classmethod
    def _from_parts(cls, args, init=True):
        self = object.__new__(cls)
        drv, root, parts = self._parse_args(args)
        self._drv = drv
        self._root = root
        self._parts = parts
        if init:
            self._init()
        return self

    @classmethod
    def _from_parsed_parts(cls, drv, root, parts, init=True):
        self = object.__new__(cls)
        self._drv = drv
        self._root = root
        self._parts = parts
        if init:
            self._init()
        return self

    @classmethod
    def _format_parsed_parts(cls, drv, root, parts):
        if drv or root:
            return drv + root + cls._flavour.join(parts[1:])
        else:
            return cls._flavour.join(parts)

    def _init(self):
        pass

    def _make_child(self, args):
        drv, root, parts = self._parse_args(args)
        drv, root, parts = self._flavour.join_parsed_parts(
            self._drv, self._root, self._parts, drv, root, parts
        )
        return self._from_parsed_parts(drv, root, parts)

    def __str__(self):
        """Return the string representation of the path, suitable for
        passing to system calls."""
        try:
            return self._str
        except AttributeError:
            self._str = (
                self._format_parsed_parts(self._drv, self._root, self._parts) or "."
            )
            return self._str

    def __fspath__(self):
        return str(self)

    def as_posix(self):
        """Return the string representation of the path with forward (/)
        slashes."""
        f = self._flavour
        return str(self).replace(f.sep, "/")

    def __bytes__(self):
        """Return the bytes representation of the path.  This is only
        recommended to use under Unix."""
        return os.fsencode(str(self))

    def __repr__(self):
        return ("{}({!r})").format(self.__class__.__name__, self.as_posix())

    def as_uri(self):
        """Return the path as a 'file' URI."""
        if not self.is_absolute():
            raise ValueError("relative path can't be expressed as a file URI")
        return self._flavour.make_uri(self)

    @property
    def _cparts(self):
        try:
            return self._cached_cparts
        except AttributeError:
            self._cached_cparts = self._flavour.casefold_parts(self._parts)
            return self._cached_cparts

    def __eq__(self, other):
        if not isinstance(other, PurePath):
            return NotImplemented
        else:
            return self._cparts == other._cparts and self._flavour is other._flavour

    def __hash__(self):
        try:
            return self._hash
        except AttributeError:
            self._hash = hash(tuple(self._cparts))
            return self._hash

    def __lt__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        else:
            return self._cparts < other._cparts

    def __le__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        else:
            return self._cparts <= other._cparts

    def __gt__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        else:
            return self._cparts > other._cparts

    def __ge__(self, other):
        if not isinstance(other, PurePath) or self._flavour is not other._flavour:
            return NotImplemented
        else:
            return self._cparts >= other._cparts

    drive = property(
        attrgetter("_drv"), doc="The drive prefix (letter or UNC path), if any."
    )
    root = property(attrgetter("_root"), doc="The root of the path, if any.")

    @property
    def anchor(self):
        """The concatenation of the drive and root, or ''."""
        anchor = self._drv + self._root
        return anchor

    @property
    def name(self):
        """The final path component, if any."""
        parts = self._parts
        if len(parts) == (1 if self._drv or self._root else 0):
            return ""
        else:
            return parts[-1]

    @property
    def suffix(self):
        """The final component's last suffix, if any."""
        name = self.name
        i = name.rfind(".")
        if 0 < i < len(name) - 1:
            return name[i:]
        else:
            return ""

    @property
    def suffixes(self):
        """A list of the final component's suffixes, if any."""
        name = self.name
        if name.endswith("."):
            return []
        else:
            name = name.lstrip(".")
            return ["." + suffix for suffix in name.split(".")[1:]]

    @property
    def stem(self):
        """The final path component, minus its last suffix."""
        name = self.name
        i = name.rfind(".")
        if 0 < i < len(name) - 1:
            return name[:i]
        else:
            return name

    def with_name(self, name):
        """Return a new path with the file name changed."""
        if not self.name:
            raise ValueError("%r has an empty name" % (self,))
        drv, root, parts = self._flavour.parse_parts((name,))
        if (
            not name
            or name[-1] in [self._flavour.sep, self._flavour.altsep]
            or drv
            or root
            or len(parts) != 1
        ):
            raise ValueError("Invalid name %r" % name)
        return self._from_parsed_parts(self._drv, self._root, self._parts[:-1] + [name])

    def with_suffix(self, suffix):
        """Return a new path with the file suffix changed (or added, if none)."""
        f = self._flavour
        if f.sep in suffix or f.altsep and f.altsep in suffix:
            raise ValueError("Invalid suffix %r" % suffix)
        if suffix and not suffix.startswith(".") or suffix == ".":
            raise ValueError("Invalid suffix %r" % suffix)
        name = self.name
        if not name:
            raise ValueError("%r has an empty name" % (self,))
        old_suffix = self.suffix
        if not old_suffix:
            name = name + suffix
        else:
            name = name[: -len(old_suffix)] + suffix
        return self._from_parsed_parts(self._drv, self._root, self._parts[:-1] + [name])

    def relative_to(self, *other):
        """Return the relative path to another path identified by the passed
        arguments.  If the operation is not possible (because this is not
        a subpath of the other path), raise ValueError.
        """
        if not other:
            raise TypeError("need at least one argument")
        parts = self._parts
        drv = self._drv
        root = self._root
        if root:
            abs_parts = [drv, root] + parts[1:]
        else:
            abs_parts = parts
        to_drv, to_root, to_parts = self._parse_args(other)
        if to_root:
            to_abs_parts = [to_drv, to_root] + to_parts[1:]
        else:
            to_abs_parts = to_parts
        n = len(to_abs_parts)
        cf = self._flavour.casefold_parts
        if root or drv if n == 0 else cf(abs_parts[:n]) != cf(to_abs_parts):
            formatted = self._format_parsed_parts(to_drv, to_root, to_parts)
            raise ValueError(
                ("{!r} does not start with {!r}").format(str(self), str(formatted))
            )
        return self._from_parsed_parts("", root if n == 1 else "", abs_parts[n:])

    @property
    def parts(self):
        """An object providing sequence-like access to the
        components in the filesystem path."""
        try:
            return self._pparts
        except AttributeError:
            self._pparts = tuple(self._parts)
            return self._pparts

    def joinpath(self, *args):
        """Combine this path with one or several arguments, and return a
        new path representing either a subpath (if all arguments are relative
        paths) or a totally different path (if one of the arguments is
        anchored).
        """
        return self._make_child(args)

    def __truediv__(self, key):
        return self._make_child((key,))

    def __rtruediv__(self, key):
        return self._from_parts([key] + self._parts)

    @property
    def parent(self):
        """The logical parent of the path."""
        drv = self._drv
        root = self._root
        parts = self._parts
        if len(parts) == 1:
            if drv or root:
                return self
            return self._from_parsed_parts(drv, root, parts[:-1])

    @property
    def parents(self):
        """A sequence of this path's logical parents."""
        return _PathParents(self)

    def is_absolute(self):
        """True if the path is absolute (has both a root and, if applicable,
        a drive)."""
        if not self._root:
            return False
        else:
            return not self._flavour.has_drv or bool(self._drv)

    def is_reserved(self):
        """Return True if the path contains one of the special names reserved
        by the system, if any."""
        return self._flavour.is_reserved(self._parts)

    def match(self, path_pattern):
        """
        Return True if this path matches the given pattern.
        """
        cf = self._flavour.casefold
        path_pattern = cf(path_pattern)
        drv, root, pat_parts = self._flavour.parse_parts((path_pattern,))
        if not pat_parts:
            raise ValueError("empty pattern")
        if drv:
            if drv != cf(self._drv):
                return False
            if root:
                if root != cf(self._root):
                    return False
            parts = self._cparts
        if drv or root:
            if len(pat_parts) != len(parts):
                return False
            pat_parts = pat_parts[1:]
        else:
            if len(pat_parts) > len(parts):
                return False
            for part, pat in zip(reversed(parts), reversed(pat_parts)):
                if not fnmatch.fnmatchcase(part, pat):
                    return False

            return True


os.PathLike.register(PurePath)


class PurePosixPath(PurePath):
    _flavour = _posix_flavour
    __slots__ = ()


class PureWindowsPath(PurePath):
    _flavour = _windows_flavour
    __slots__ = ()


class Path(PurePath):
    __slots__ = ("_accessor", "_closed")

    def __new__(cls, *args, **kwargs):
        if cls is Path:
            cls = WindowsPath if os.name == "nt" else PosixPath
        self = cls._from_parts(args, init=False)
        if not self._flavour.is_supported:
            raise NotImplementedError(
                "cannot instantiate %r on your system" % (cls.__name__,)
            )
        self._init()
        return self

    def _init(self, template=None):
        self._closed = False
        if template is not None:
            self._accessor = template._accessor
        else:
            self._accessor = _normal_accessor

    def _make_child_relpath(self, part):
        parts = self._parts + [part]
        return self._from_parsed_parts(self._drv, self._root, parts)

    def __enter__(self):
        if self._closed:
            self._raise_closed()
        return self

    def __exit__(self, t, v, tb):
        self._closed = True

    def _raise_closed(self):
        raise ValueError("I/O operation on closed path")

    def _opener(self, name, flags, mode=438):
        return self._accessor.open(self, flags, mode)

    def _raw_open(self, flags, mode=511):
        """
        Open the file pointed by this path and return a file descriptor,
        as os.open() does.
        """
        if self._closed:
            self._raise_closed()
        return self._accessor.open(self, flags, mode)

    @classmethod
    def cwd(cls):
        """Return a new path pointing to the current working directory
        (as returned by os.getcwd()).
        """
        return cls(os.getcwd())

    @classmethod
    def home(cls):
        """Return a new path pointing to the user's home directory (as
        returned by os.path.expanduser('~')).
        """
        return cls(cls()._flavour.gethomedir(None))

    def samefile(self, other_path):
        """Return whether other_path is the same or not as this file
        (as returned by os.path.samefile()).
        """
        st = self.stat()
        try:
            other_st = other_path.stat()
        except AttributeError:
            other_st = os.stat(other_path)

        return os.path.samestat(st, other_st)

    def iterdir(self):
        """Iterate over the files in this directory.  Does not yield any
        result for the special paths '.' and '..'.
        """
        if self._closed:
            self._raise_closed()
        for name in self._accessor.listdir(self):
            if name in frozenset({".", ".."}):
                continue
            yield self._make_child_relpath(name)
            if self._closed:
                self._raise_closed()

    def glob(self, pattern):
        """Iterate over this subtree and yield all existing files (of any
        kind, including directories) matching the given pattern.
        """
        if not pattern:
            raise ValueError(("Unacceptable pattern: {!r}").format(pattern))
        pattern = self._flavour.casefold(pattern)
        drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
        if drv or root:
            raise NotImplementedError("Non-relative patterns are unsupported")
        selector = _make_selector(tuple(pattern_parts))
        for p in selector.select_from(self):
            yield p

    def rglob(self, pattern):
        """Recursively yield all existing files (of any kind, including
        directories) matching the given pattern, anywhere in this subtree.
        """
        pattern = self._flavour.casefold(pattern)
        drv, root, pattern_parts = self._flavour.parse_parts((pattern,))
        if drv or root:
            raise NotImplementedError("Non-relative patterns are unsupported")
        selector = _make_selector(("**",) + tuple(pattern_parts))
        for p in selector.select_from(self):
            yield p

    def absolute(self):
        """Return an absolute version of this path.  This function works
        even if the path doesn't point to anything.
        
        No normalization is done, i.e. all '.' and '..' will be kept along.
        Use resolve() to get the canonical path to a file.
        """
        if self._closed:
            self._raise_closed()
        if self.is_absolute():
            return self
        else:
            obj = self._from_parts([os.getcwd()] + self._parts, init=False)
            obj._init(template=self)
            return obj

    def resolve(self, strict=False):
        """
        Make the path absolute, resolving all symlinks on the way and also
        normalizing it (for example turning slashes into backslashes under
        Windows).
        """
        if self._closed:
            self._raise_closed()
        s = self._flavour.resolve(self, strict=strict)
        if s is None:
            self.stat()
            s = str(self.absolute())
        normed = self._flavour.pathmod.normpath(s)
        obj = self._from_parts((normed,), init=False)
        obj._init(template=self)
        return obj

    def stat(self):
        """
        Return the result of the stat() system call on this path, like
        os.stat() does.
        """
        return self._accessor.stat(self)

    def owner(self):
        """
        Return the login name of the file owner.
        """
        import pwd

        return pwd.getpwuid(self.stat().st_uid).pw_name

    def group(self):
        """
        Return the group name of the file gid.
        """
        import grp

        return grp.getgrgid(self.stat().st_gid).gr_name

    def open(self, mode="r", buffering=-1, encoding=None, errors=None, newline=None):
        """
        Open the file pointed by this path and return a file object, as
        the built-in open() function does.
        """
        if self._closed:
            self._raise_closed()
        return io.open(
            str(self), mode, buffering, encoding, errors, newline, opener=self._opener
        )

    def read_bytes(self):
        """
        Open the file in bytes mode, read it, and close the file.
        """
        with self.open(mode="rb") as (f):
            return f.read()

    def read_text(self, encoding=None, errors=None):
        """
        Open the file in text mode, read it, and close the file.
        """
        with self.open(mode="r", encoding=encoding, errors=errors) as (f):
            return f.read()

    def write_bytes(self, data):
        """
        Open the file in bytes mode, write to it, and close the file.
        """
        view = memoryview(data)
        with self.open(mode="wb") as (f):
            return f.write(view)

    def write_text(self, data, encoding=None, errors=None):
        """
        Open the file in text mode, write to it, and close the file.
        """
        if not isinstance(data, str):
            raise TypeError("data must be str, not %s" % data.__class__.__name__)
        with self.open(mode="w", encoding=encoding, errors=errors) as (f):
            return f.write(data)

    def touch(self, mode=438, exist_ok=True):
        """
        Create this file with the given access mode, if it doesn't exist.
        """
        if self._closed:
            self._raise_closed()
        if exist_ok:
            try:
                self._accessor.utime(self, None)
            except OSError:
                pass
            else:
                return

            flags = os.O_CREAT | os.O_WRONLY
            if not exist_ok:
                flags |= os.O_EXCL
            fd = self._raw_open(flags, mode)
            os.close(fd)

    def mkdir(self, mode=511, parents=False, exist_ok=False):
        """
        Create a new directory at this given path.
        """
        if self._closed:
            self._raise_closed()
        try:
            self._accessor.mkdir(self, mode)
        except FileNotFoundError:
            if not parents or self.parent == self:
                raise
            self.parent.mkdir(parents=True, exist_ok=True)
            self.mkdir(mode, parents=False, exist_ok=exist_ok)
        except OSError:
            if not exist_ok or not self.is_dir():
                raise

    def chmod(self, mode):
        """
        Change the permissions of the path, like os.chmod().
        """
        if self._closed:
            self._raise_closed()
        self._accessor.chmod(self, mode)

    def lchmod(self, mode):
        """
        Like chmod(), except if the path points to a symlink, the symlink's
        permissions are changed, rather than its target's.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.lchmod(self, mode)

    def unlink(self):
        """
        Remove this file or link.
        If the path is a directory, use rmdir() instead.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.unlink(self)

    def rmdir(self):
        """
        Remove this directory.  The directory must be empty.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.rmdir(self)

    def lstat(self):
        """
        Like stat(), except if the path points to a symlink, the symlink's
        status information is returned, rather than its target's.
        """
        if self._closed:
            self._raise_closed()
        return self._accessor.lstat(self)

    def rename(self, target):
        """
        Rename this path to the given path.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.rename(self, target)

    def replace(self, target):
        """
        Rename this path to the given path, clobbering the existing
        destination if it exists.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.replace(self, target)

    def symlink_to(self, target, target_is_directory=False):
        """
        Make this path a symlink pointing to the given path.
        Note the order of arguments (self, target) is the reverse of os.symlink's.
        """
        if self._closed:
            self._raise_closed()
        self._accessor.symlink(target, self, target_is_directory)

    def exists(self):
        """
        Whether this path exists.
        """
        try:
            self.stat()
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

        return True

    def is_dir(self):
        """
        Whether this path is a directory.
        """
        try:
            return S_ISDIR(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_file(self):
        """
        Whether this path is a regular file (also True for symlinks pointing
        to regular files).
        """
        try:
            return S_ISREG(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_symlink(self):
        """
        Whether this path is a symbolic link.
        """
        try:
            return S_ISLNK(self.lstat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_block_device(self):
        """
        Whether this path is a block device.
        """
        try:
            return S_ISBLK(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_char_device(self):
        """
        Whether this path is a character device.
        """
        try:
            return S_ISCHR(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_fifo(self):
        """
        Whether this path is a FIFO.
        """
        try:
            return S_ISFIFO(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def is_socket(self):
        """
        Whether this path is a socket.
        """
        try:
            return S_ISSOCK(self.stat().st_mode)
        except OSError as e:
            if e.errno not in (ENOENT, ENOTDIR):
                raise
            return False

    def expanduser(self):
        """ Return a new path with expanded ~ and ~user constructs
        (as returned by os.path.expanduser)
        """
        if not (self._drv or self._root):
            if self._parts:
                if self._parts[0][:1] == "~":
                    homedir = self._flavour.gethomedir(self._parts[0][1:])
                    return self._from_parts([homedir] + self._parts[1:])
                return self


class PosixPath(Path, PurePosixPath):
    __slots__ = ()


class WindowsPath(Path, PureWindowsPath):
    __slots__ = ()

    def owner(self):
        raise NotImplementedError("Path.owner() is unsupported on this system")

    def group(self):
        raise NotImplementedError("Path.group() is unsupported on this system")
